Cattron LRC-L1 User manual

LRC-M1 and LRC-L1
Remote Control
Operator Control Unit (OCU)
User Manual
9M02-7634-A001-EN

LRC-M1 and LRC-L1 Remote Control
User Manual
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9M02-7634-A001-EN
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Revision History
Revision
Date
Changes
0.0
Initial Release
1.0
08/01/2014
Updated styles and combined LRC-M and LRC-L manuals
2.0
08/06/2014
Added LRC-M1 Declaration of Conformity and LRC-M1
Declaration of Incorporation
2.1
06/2015
Corrected document reference number
Updated Contact information
Updated headings
3.0
07/29/2019
Document rebranded and contact information updated.
Added 869MHz narrow band
Added DOC
Any informationfurnishedby Cattron™ anditsagentsis believedto beaccurateand reliable.All specificationsare subject to changewithoutnotice. Responsibilityfortheuse
and application of CattronproductsrestswiththeendusersinceCattronand itsagentscannotbe awareofallpotentialuses.Cattronmakes nowarranties as to non-
infringementnoras tothe fitness, merchantability, orsustainabilityof any Cattron products for any specificor general uses. CattronHoldings, Inc., orany ofits
affiliatesoragentsshallnot be liablefor incidental or consequentialdamages of any kind. All Cattron products are sold pursuant to the Terms and Conditions of Sale, a
copy of which will be furnished upon request. When used as a tradename herein, Cattron means Cattron Holdings, Inc. or one or more subsidiaries of Cattron
Holdings, Inc. Cattron™, corresponding logos, and other marks are trademarks or registered trademarksofCattronHoldings,Inc.Othermarksmaybetheproperty
ofthirdparties.NothinghereinprovidesalicenseunderanyCattronoranythirdpartyintellectualpropertyright.

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Contents
Revision History ..................................................................................................................................................................................2
1. Introduction...................................................................................................................................................................................5
1.1 Terminology .......................................................................................................................................................5
2. Safety Instructions.......................................................................................................................................................................6
2.1 Symbols and Warning Definitions......................................................................................................................6
2.2 General Safety Information................................................................................................................................6
2.3 Intended Purpose Use .......................................................................................................................................7
2.4 Improper Use .....................................................................................................................................................7
2.5 Operation of OCUs and MCUs with Identical System Addresses......................................................................8
3. General .........................................................................................................................................................................................9
3.1 Radio Transmission ...........................................................................................................................................9
3.1.1 Continuous Transmission..............................................................................................................................9
3.1.2 Radio Interference ..........................................................................................................................................9
3.2 System Address.................................................................................................................................................9
3.3 System Parameters..........................................................................................................................................10
4. OCU.............................................................................................................................................................................................11
4.1 General ............................................................................................................................................................11
4.2 Display Option..................................................................................................................................................12
4.3 Before Turning On............................................................................................................................................12
4.4 Turning the OCU On (Standard)......................................................................................................................12
4.5 Turning the OCU On with STOP Switch Verification........................................................................................13
4.6 Turning the OCU Off........................................................................................................................................13
4.7 STOP Command..............................................................................................................................................13
4.8 Status LED.......................................................................................................................................................13
5. Features......................................................................................................................................................................................14
5.1 Automatic Turn-Off...........................................................................................................................................14
5.2 Enable / Push to Operate (PTO) Switches.......................................................................................................14
5.3 Vigilance...........................................................................................................................................................14
5.4 Tilt ....................................................................................................................................................................14
5.5 IR Enable .........................................................................................................................................................15
5.6 Delayed Shutoff................................................................................................................................................16
5.7 User Authorization............................................................................................................................................16
5.8 Multi Address Capability (MAC).......................................................................................................................16
5.9 Sub Address Capability (SAC).........................................................................................................................17
5.10 D-TDMA...........................................................................................................................................................19
5.11 Frequency Scanning........................................................................................................................................21
5.12 Talkback and LCD Display Resolution.............................................................................................................21

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6. Battery Management.................................................................................................................................................................23
6.1 Connecting the Battery Charger.......................................................................................................................23
6.2 Charging the Battery........................................................................................................................................24
6.3 Charging Status Indication via LEDs................................................................................................................24
6.4 Charging and LED Indication...........................................................................................................................24
7. RF Channel Change .................................................................................................................................................................25
7.1 Working Principle.............................................................................................................................................25
7.2 Activating the Programming Mode...................................................................................................................25
7.3 Changing the RF Channel................................................................................................................................26
7.4 MCU Synchronization to New RF Channel......................................................................................................26
7.5 Reactivating the TransKey RF Channel...........................................................................................................26
7.6 Indication of the Interference Field Strength....................................................................................................26
7.7 Automatic RF Channel Selection Feature........................................................................................................27
7.8 Channel Tables................................................................................................................................................28
8. Technical Data...........................................................................................................................................................................35
8.1 LRC-L1 Specifications......................................................................................................................................35
8.2 LRC-M1 Specifications.....................................................................................................................................37
Compliance........................................................................................................................................................................................39
CE Declaration of Conformity...........................................................................................................................39
9. Troubleshooting.........................................................................................................................................................................40
9.1 OCU Error Indication........................................................................................................................................40

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1. Introduction
This manual includes general information concerning the operation of the radio remote control Operator Control
Unit (OCU) series LRC-M1 and LRC-L1. The information is of a general nature and does not include system-
specific data. System-specific data is provided in the technical documentation accompanying the delivery of the
system.
For Information pertaining to the matching Machine Control Unit (MCU), please refer to the separate MCU user
manual.
1.1 Terminology
The following represents important acronyms used in this document:
•OCU - Operator Control Unit, commonly referred to as a transmitter
•MCU - Machine Control Unit, commonly referred to as a receiver
LRC-L1 LRC-M1
Figure 1: Typical OCU

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2. Safety Instructions
2.1 Symbols and Warning Definitions
Warning against hazardous situation
Warning against electrical voltage
DANGER
Calls attention to a dangerous situation with high risk; severe injuries or death possible.
WARNING
Calls attention to a situation with medium risk; severe injuries possible.
CAUTION
Calls attention to a situation with low risk; injuries or damage to the device possible.
Note:
Calls attention to important information.
2.2 General Safety Information
•Persons under the influence of drugs, alcohol and/or other medicine that impairs reaction may not
assemble, disassemble, install, put into operation, repair, or operate the product.
•All conversions and modifications of an installation or system must conform to the relevant safety
requirements. Only qualified, authorized personnel may perform work on the electrical equipment, in
accordance with the relevant safety requirements.
•In the event of malfunction and/or visible defects or irregularities, the product must be stopped, switched off,
and the relevant master switches also switched off.
WARNING
Observe the statutory regulations and directives applicable for the intended purpose, e.g.:
•Accident prevention regulations
•Safety rules and directives
•Standards
•Generally applicable statutory and other binding regulations for accident prevention and
environmental protection, and general safety and health requirements.
!
!

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•Keep the operating manual permanently accessible at the place of product use.
•The personnel assigned to work on/with the product must have read and understood this operating manual
and the safety instructions.
•The safety instructions must, if necessary, be supplemented by the user with instructions concerning the
work organization, work sequences, qualified personnel, etc.
•All repairs made during the warranty period must be carried out by the manufacturer or appointed
authorized service center; failure to comply will invalidate the warranty.
•Only trained personnel may perform maintenance and repair on the product.
•All repairs should be carried out in a suitably clean, static-safe environment, free from contaminants such
as metal filings, water, oil, etc.
•It is the user’s responsibility to ensure that the product is always maintained in a good operating condition
and that all applicable safety requirements and regulations are observed.
•Product modifications may not be carried out without the consent of the manufacturer.
•Original spare parts from the manufacturer must be used.
•Carry out periodic inspections and/or maintenance either as required by law or as prescribed in the user
manual within the required intervals.
2.3 Intended Purpose Use
The product must only be used in a good condition, by instructed personnel, and subject to the compliance with
the applicable safety and accident prevention regulations. Use only for the intended purpose and with compliance
to the contents of this user manual.
2.4 Improper Use
Certain use and work on/with the product is not permitted. In particular, improper use consists of the following
actions:
•Tampering with electrical equipment
•Power supply connections deviating from the voltage/frequency data on the type plate
•Work on live components
•Incorrect operation
•Unauthorized removal of covers
•Insufficient maintenance
•Failure to observe the operating temperature range
CAUTION
Damage to the device:
The unit is rated at IP65. It is not rated to be submerged in water.
Neglecting the above can result in danger for life and limb and/or cause physical damage to the product or the
environment.
!

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2.5 Operation of OCUs and MCUs with Identical System Addresses
To ensure safe operation, OCUs and MCUs are uniquely paired by means of an identical system address. This
system address will only be assigned once by the manufacturer.
CAUTION
Conflict of Addresses:
The user must ensure that the system address is used as designed and intended for a single
system.
The system address is marked on the master TransKey; the OCU and intended MCU address
must match.
In the event of a breach of this undertaking, the user is liable for any resulting damage/loss and
shall indemnify the manufacturer against all third-party liability claims.
!

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3. General
With an OCU and a matching MCU, a machine such as a crane or vehicle can be remotely radio controlled,
avoiding the need for a wired connection between the human interface and the controlled device. A number of
different control elements are integrated into the OCU housing so that commands to the device are securely
encoded into a radio transmission. The MCU is then able to receive this transmission, securely decode these
commands, and provide suitable interfaces to drive the machine.
3.1 Radio Transmission
The transmission between the OCU and MCU is performed by means of radio communication. With regard to the
actual radio frequency that is used, there are several radio frequency bands available. A specific RF channel must
be selected within the respective frequency band. Depending on the frequency band, a certain number of RF
channels are available. For details regarding the available standard RF channels please refer to the Channel
Tables and Technical Data sections of this document. Other frequency bands may be designated and deployed.
The OCU and MCU must operate on the same RF channel in order to be able to communicate.
3.1.1 Continuous Transmission
Typically, transmission is continuous and the MCU uses this as part of the information required to maintain the
safety relays in an active state. If the MCU does not receive a valid telegram in this mode for a certain period of
time (defined as PNH-Time), it automatically turns off; i.e., safety relays and command relays open. Depending on
the application, the PNH-Time varies from 0.5 s to 2.0 s.
In order to ensure optimum communication between the OCU and the MCU in this mode, ideally operate the OCU
with line of sight to the MCU or its antenna at all times. Avoid total shielding by metallic obstructions.
In certain other configurations, the MCU may be enabled to operate without loss of safety in the absence of an RF
signal, much as a safety PLC will do. Such applications are strictly defined.
3.1.2 Radio Interference
Signals from other RF-emitting sources might interfere with the radio communication between the OCU and MCU.
If the radio link is affected by these sources, changing the RF channel or even the RF band might be necessary.
3.2 System Address
In an industrial radio remote control system, each OCU/MCU pair shares a common, unique system address. This
system address is contained in every telegram sent by the OCU and is checked by the MCU every time a RF
signal is received. The MCU processes a command only when the address in the telegram and the address
stored in the MCU match. This is a safety measure to ensure that the MCU will act only upon its assigned OCU.
The system address is stored in the TransKeys; please see Section 0.
Figure 2: OCU TransKey (black)

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3.3 System Parameters
The system parameters, including the system address and the selected RF channel, are set by programming the
TransKey. This is a removable radio frequency identification device (RFID) located inside the OCU and MCU. It is
programmed by the manufacturer.
Note: Please refer to the separate 'Configuration Data' documents for the specific system parameter settings
of your system.

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4. OCU
4.1 General
The LRC OCU is versatile and can be highly customized to meet the operational requirements of many different
applications. For this, a variety of control elements (joysticks, paddles, push buttons, switches, etc.) are available
to tailor an OCU layout for the individual application.
Note: For the system-specific OCU layout for your application, please refer to the separate engineering
drawings you received with the delivery of the system.
1 Stop Switch
2 LED/Push-button Panel
3 Joystick
4 Push Button Horn
5 Key switch: ON/OFF
6 Carrying Hook
7 Toggle Switch (maintained)
8Toggle Switch (momentary)
9Toggle Switch (maintained)
10 Push-button
11 Push-button
Figure 3: LRC-L1 Layout Example
1 Master TransKey
2 TransKey Hollow
3 Battery and Programming
Contacts
4 Battery Latch
Figure 4: LRC Battery Compartment

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1 Stop Switch
2 Push Button
3 Key Switch: ON/OFF
4 Push Button Horn
5 Joystick
6 Status LED
7 Graphic LCD (optional)
Figure 5: LRC-M1 with LCD
4.2 Display Option
The OCU can be optionally equipped with a graphic display. This can be used to indicate certain OCU parameters
such as the operating frequency, internal error messages and battery status, and/or to display feedback data that
transmits back from the corresponding MCU (in this case, it functions as a transceiver, receiving and transmitting
data). For further information regarding the feedback option, please refer to the system-specific information
provided with your system.
4.3 Before Turning On
1. Verify that the TransKey (black) is placed in the TransKey hollow inside the battery compartment.
2. Insert a fully charged battery.
Note: Batteries are shipped uncharged.
4.4 Turning the OCU On (Standard)
1. Release the STOP switch and ensure all motion controls including joysticks are at neutral.
2. Turn the key switch to the ON position 'I'.
3. The Status LED briefly lights red, then flashes green.
4. The OCU is turned on.
Note: After the OCU is turned on, the safety relays in the MCU energize and the MCU is able to respond to
commands initiated by the OCU.

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4.5 Turning the OCU On with STOP Switch Verification
(this feature is only made available if requested at time of order)
The OCU can be configured so that in order to turn on the unit, the STOP switch must be activated once before
the OCU goes into operation.
1. Release the STOP switch and ensure all motion controls including joysticks are at neutral.
2. Turn the key switch to the ON position 'I'.
3. The Status LED lights red.
4. Activate the STOP switch (the Status LED lights orange) and then release within 10 seconds.
5. The Status LED flashes green.
6. The OCU is turned on.
Note: After the OCU is turned on, the safety relays in the MCU energize and the MCU is able to respond to
commands initiated by the OCU.
4.6 Turning the OCU Off
1. Turn the OCU off by bringing the key switch into the '0' position.
Note: After the OCU turns off, the safety relays and all other relays (in the case of a relay interface) in the
MCU de-energize and the MCU is unable to respond to any commands initiated by the OCU.
In certain application, the MCU can optionally be configured to operate as a safety PLC and continue to
control the machine in the absence of an online OCU. Conditions will be strictly defined.
4.7 STOP Command
In the event of a dangerous situation, a STOP command can be initiated by pressing the STOP switch.
1. Press the STOP switch.
2. MCU turns off.
3. OCU turns off.
Note: After pressing the STOP switch, the safety relays and all other commands in the MCU de-energize and
the MCU is unable to respond to any commands initiated by the OCU. The OCU unit is turned off.
4.8 Status LED
The status LED indicates the operation mode and error messages.
Table 1: Status LED Indications
Status LED
Condition
Corrective Action
Flashes green at 2.0 s intervals
Normal mode
No action required
Flashes red at 2.0 s intervals
Error indication
Refer to Section 9: Troubleshooting
Flashes red at 0.5 s intervals
Pre-warning of low voltage
Change the battery within 10 minutes

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5. Features
5.1 Automatic Turn-Off
The OCU turns off automatically when the following events occur:
•Battery discharge protection (battery low)
•Auto Off timeout expires (pre-set between 30 seconds to 30 minutes)
•Internal failure (hardware or software)
5.2 Enable / Push to Operate (PTO) Switches
Push to Operate is an optional feature that requires the user to press a switch before a function or set of functions
are made active. This can be applied to any controller and is implemented in the MCU software.
When a switch must be pressed down while the joystick is in use, operators may find it physically demanding. For
this reason, the PTO button is normally used as an enable to start the motion; that is, the button must be pressed
before a motion is activated, but once the motion is active the button does not need to be maintained. Once the
motion is returned to neutral, there is an approximately 2 second delay (during which the motion can be
reactivated) before the button once again has to be pressed.
Often, a client will choose not to use the buttons at the end of the joysticks, but instead use a button or toggle on
the controller that must be pressed just before commencing to activate a motion. It achieves the same goal but
typically at lower cost.
Because it is used in logic, the enable function on a joystick, button, or toggle can be used to enable any single or
set of functions on the controller.
5.3 Vigilance
The Vigilance function is an optional feature and is another method of maintaining the system in an active state; it
is available for any LRC controller.
This method requires the operator to repeatedly activate a switch before a software timer expires.
As an example, an operator may be required to activate a toggle switch every 30 seconds or less. If the operator
fails to reset the toggle switch, a warning is issued for 10 seconds. During this period the operator can still reset
the vigilance function, but if this period times-out without resetting, the OCU shuts down.
The Timeout time is configurable for any time between 1 second and 11 minutes, in 1 second increments.
The Warning period is configurable between 0 and 59 seconds.
Note that this feature is more closely related to machine and vehicle operation than crane use.
5.4 Tilt
The Tilt function is an optional feature and a safety function designed to shut down the OCU if it is tilted (for
example, if an operator falls over). It is available for any LRC OCU.
The Tilt angle may be configured for angles between 30 and 60 degrees in 5 degree increments.
The Tilt time delay (the period for which the unit can remain tilted before a penalty) is configurable between 0 and
30 seconds. During this period the OCU issues an audible warning of impending penalty.

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There is a Tilt time extension that can be configured, if required, that allows the operator to extend the tilt time by
another configurable time of up to 30 seconds.
Typically, the tilt settings are configured so that if an angle greater than 45 degrees is exceeded for more than 5
seconds, the unit shuts down.
If an operator has some process where he does bend over, the Tilt time extension is added and set for 30
seconds to allow the process to be completed without a penalty.
Note that this feature is more closely related to machine and vehicle operation than crane use.
5.5 IR Enable
The IR Enable function is an optional feature.
This feature requires the OCU to be taken within a closely defined zone of coverage from an IR (infrared)
transmitter before the OCU can be enabled.
The enable zone is typically used to ensure that an OCU is not switched on before an operator has moved into a
region where it is safe to operate the crane or machine. Specifically, it ensures that the OCU cannot be enabled
when it is away from a crane or machine. An example of this function is to prevent a situation whereby the OCU
radio can communicate through walls to the crane or machine, but it is inadvertently operated in an adjacent room
such as a cafeteria or maintenance workshop.
The IR transmitters shown below are mounted either singly or in multiples as required to achieve the required IR
coverage zone.
Figure 6: IR Enable Components
The IR beam is specifically encoded to address only the target system and is fully secure.
The OCU has an IR sensor mounted on it and the LRC-M and LRC-L can have the sensor in any location. The
product shown above right has the sensor to the right of the Stop switch.

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5.6 Delayed Shutoff
The Delayed Shutoff function is an optional feature.
Delayed Shutoff enables a controlled OCU shutdown mode that allows a user to switch from remote operating
mode to a local operating mode without the machine going into a shutdown.
For example, this allows a diesel engine driven hydraulic machine to continue to run for this short transfer period
rather than the operator going through a machine/engine start sequence to get it back into manual mode. This is
typically required when the OCU is left in a storage location remote from the vehicle cab; one example may be
use in underground mining machines.
In this mode, an OCU remains active for a predefined time delay between 30 seconds and 5 minutes after the
ON/OFF switch turns off. During this “DSO period”, all OCU controls are disabled except for the STOP and TILT
functions.
The OCU turns off when one of the following events is true:
•The DSO period expires
•The STOP button is pressed
•A TILT event occurs (if configured)
5.7 User Authorization
The User Authorization feature is an option for LRC-M and LRC-L OCUs.
This feature requires the system to be enabled by the insertion of an ID card into a receptacle on the OCU. This
receptacle reads the card and compares the ID card to a list of pre-defined users. If the card is current, the OCU
sends a signal to the MCU that the user is authorized and enables control.
5.8 Multi Address Capability (MAC)
MAC is an optional feature and allows up to 15 MCUs to be controlled by up to seven OCUs.
Some simple examples are below; each MCU is equipped with a number of lights outputs to indicate the current
status.
Multi Control Mode Single Control Mode
Figure 7: MAC Configurations

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REQUEST Function
MCUs are requested by an OCU. This is performed using a separate Request button in conjunction with the
position of an MCU selection on the OCU. The selection can be linked to one or more MCUs.
LRC OCUs have a rotary MCU selection switch.
All of the MCUs assigned to a selected switch position are always requested together.
MCUs assigned to an OCU as a result of a request remain permanently assigned to that OCU until released.
Additional MCUs may be requested by that OCU. Selected MCUs cannot be accessed by other OCUs.
Once one or more MCUs are requested, it is possible to switch between the various available combinations of
MCUs by altering the selection on the OCU.
RELEASE Function
The Release button is used to release the MCU(s) currently selected by an OCU.
An OCU can only release MCUs which it has previously requested. Conversely, MCUs not assigned to a specific
OCU cannot be released by that OCU.
One or multiple MCUs can be released at the same time. The MCU can be set to automatically release.
5.9 Sub Address Capability (SAC)
The SAC optional feature is available for the LRC-L OCU and the MMCU4 or CT24 MCUs.
It allows one OCU to have secure and simultaneous selection of up to four MCUs from a larger number of MCUs.
With this feature, there is no possibility that any two OCUs can attempt to select the same MCU at the same time.
For example, this feature allows the sequential selection of MCUs in a process flow. Keys 1 and 2 might represent
hoist units 1 and 2, Keys 3 and 4 may represent sequential bridges, and the spare keys may represent further
sequential bridges.
Each of the selected MCUs can be enabled or disabled by an associated toggle switch.
There are three versions of SAC defined in the following ways:
•One OCU may select 4 out of 512 MCUs
•One OCU may select 3 out of 4096 MCUs
•One OCU may select 2 out of 262,144 MCUs
SAC TransKeys
The identities of the selected MCUs are input by a secure, red, RF TransKey inserted into a dual holder on the left
and right faces of the OCU. An OCU has the option of two or four slots and either two or four associated toggle
switches.
Two storage slots on the rail can hold unused keys.

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Sub Address Key Read Status
The sub address key read status is shown on both the status LEDs and the optional LCD (if fitted to the OCU).
Figure 8: SAC LED Status Indications
•Empty Socket: The corresponding LED remains off
•Successful Reading: The corresponding LED flashes green
•Reading Failure: The corresponding LED flashes red
OCUs equipped with an LCD will display the actual sub addresses being read and the current selection status on
lines 2 and 3.
Figure 9: SAC LCD Status Indications
Deselected MCUs (toggle switch OFF) are shown in normal text (black text on a white background).
Selected MCUs (toggle switch ON) are shown in inverted text (white text on a black background).
The MCU may store up to five sub addresses and locks onto the first valid sub address found. This feature allows
one MCU to be able to respond to a maintenance or spare TransKey (in the event of loss of the primary sub
address TransKey) without ever having to duplicate a TransKey sub address on one site. For example, an MCU
may be programmed to respond to SA, 1, 101, 201, 301, 401, 501.
The Sub Addresses are stored in the MCU primary TransKey.

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Sub Addressing Operational Procedure
1. Ensure the battery has sufficient charge.
2. Verify the OCU is in good condition.
3. Select the required Sub Address TransKeys to match the machines to be controlled. Insert these
TransKeys into the TransKey retainers on the left and right faces of the OCU.
4. Switch the sub address selection switches to the OFF positions.
5. Ensure the control levers are in the neutral position; controls in the off-neutral position will prevent
system start.
6. Ensure the E-Stop switch is released.
7. Ensure the Key/ON/OFF switch is turned ON.
8. The status LED should now flash green; however, if D-TDMA is in use, the status LED gives two
rapid orange flashes every second until the OCU finds and locks onto a free TDMA slot. Usually, this
takes less than a few seconds. The LED flashes green afterwards. If the status LED is flashing red or
not flashing at all, refer to Section 9: Troubleshooting.
9. Press and hold the reset button until all the machines reset as indicated by their individual status
lamps (a visible lamp positioned on the machine that indicates it is powered and reset, ready for use).
This can take up to approximately 5 seconds.
10. Switch on each of the sub address selection switches one at a time and test a basic function (such as
Horn) to ensure the required and expected machine is being commanded. When this is complete and
all machines verified, the required machine selection can be made and operation commenced.
Deselection of any machine is possible at any time by switching off the control toggle switch associated with that
sub address.
Removing any sub address TransKey disables that machine within five seconds. An alternate key could be
inserted without switching off the OCU, but the reset switch would need to be pressed again to capture that
machine, after which it should once again be verified that the correct machine has been activated.
5.10 D-TDMA
TDMA is an optional feature that allows many systems to operate on the same frequency, either to minimize the
number of RF licenses required on a large site or to make it possible to implement a system that requires many
OCUs to be on the same frequency at the same time.
It is possible to have MCUs use both TDMA and frequency scanning when implementing a large or complex
system comprising many MCUs.
As more TDMA slots allocate to a frequency, the system response to a switch change becomes slower, so a
balance between allocated TDMA slots and required response times is needed.

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Table 2: TDMA Response Time
# OCU per Channel
TDMA Cycle Time
3
140 ms
4
175 ms
5
210 ms
6
245 ms
7
280 ms
8
315 ms
OCU Slot Acquisition Time
This time is measured from OCU power-up to the MCU being online.
< 5.1 sec for 265 ms cycle times
< 4.6 sec for 150 ms cycle times
When operating D-TDMA and after switching on the OCU, the status LED gives two rapid orange flashes every
second until the OCU has found and locks onto a free TDMA slot. This typically takes less than a few seconds
after which it should flash green.
If an optional LCD display is fitted, this will also give additional TDMA status indication, as seen in the following
figure.
Figure 10: D-TDMA LCD Status Indications
At power-up, the first telegram transmission is declared “Slot #1”. Its index would be set to “C” (for Current) and it
displays on the left side of LCD screen. This slot timing would be set as reference and kept in memory as long as
the radio is transmitting telegrams. All other slots are shown following this reference point; free slots are shown as
normal text (black text on a white background) and occupied slots are shown as inverted text (white text on a
black background).
Note that all OCUs are running asynchronously, so slot 1 on one OCU may not be the same as slot 1 on any
other OCU.